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Grimmspeed Uppipe - Fits 04-21 STI / 02-14 WRX

Grimmspeed Uppipe - Fits 04-21 STI / 02-14 WRX


Regular price $269.00 USD
Regular price Sale price $269.00 USD
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Adding a well-design, well-built aftermarket up-pipe is one of the first things you should do to your Subaru. Our ultimate goal was to make the best up pipe the aftermarket has to offer.


We designed this up pipe using our in-house FARO Arm along with the latest and greatest Solidworks CAD Software. This assures that we can offer you the most precise and best fitting up pipe on the market. OEM exhaust manifold pieces are inconsistent so we used our reverse engineering hardware/software to scan countless OEM pieces to determine the range of best fitments for our aftermarket pipe. This allows us to be very confident that your flanges will be leak-free and the up-pipe will fit perfectly every time.


Our up-pipe is made with the best local raw materials available. The flex joint is 321 Stainless Steel w/ an Interlocking Liner and the tubing is a heavy-duty 14 Gauge 304 Stainless Steel (competitors use thinner 16 GA) that has been precisely CNC Mandrel Bent; our flanges are made out of 1/2" 304 Stainless Steel and are put through a tumbling process to smooth out the edges. The pipe is hand-welded on the inside of the flange, in addition to the outside, allowing for added strength to the finished product and a nice mating surface with optimal flow through the pipe. All fabrication is completed by our team of Certified Welders/Fabricators which ensures that each and every up pipe that comes out of our facility will handle anything you throw at it!


Flow Bench Results vs. OEM at 28" WC
OEM Catless - 244.6 CFM
OEM Catted - 164.7 CFM
GrimmSpeed - 292.6 CFM

Spool Up 
Application-specific but generally you will see 300-400rpm quicker spool up

Quick Specs

  • Gaskets Included - Heavy Duty GrimmSpeed Gaskets
  • Flex Joint - 321 Stainless Steel "Tuned-Bellow"
  • Tubing Thickness- 14 Gauge Piping Thickness - 33% thicker than most competitors
  • Pipe to Flange Connection - Hand-welded on both outside/inside of the flange for an extremely strong connection
  • Flanges - 1/2" 304 Stainless Steel 
  • Optional Ceramic Coating
  • Reduce Turbo Lag

Continually striving for perfection, it's what you can expect from GrimmSpeed™



The GrimmSpeed Up-Pipe is designed to fit USDM Subaru EJ-Series Turbo Engines. The official fitments for these units are:

  • 04-21 Impreza STI
  • 06-14 Impreza WRX
  • 06-08 Forester XT
  • 07-09 Legacy GT
  • 07-09 Outback XT
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